Return-Path: Received: from mtain-de06.r1000.mx.aol.com (mtain-de06.r1000.mx.aol.com [172.29.64.206]) by air-me09.mail.aol.com (v129.4) with ESMTP id MAILINME093-8bc24d2dc68d8f; Wed, 12 Jan 2011 10:19:41 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7AA4F380000AC; Wed, 12 Jan 2011 10:19:40 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pd2T7-0007pw-MZ for rs_out_1@blacksheep.org; Wed, 12 Jan 2011 15:18:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pd2T7-0007pm-82 for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2011 15:18:37 +0000 Received: from smtpout04.highway.telekom.at ([195.3.96.117] helo=email.aon.at) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pd2T5-00083b-K3 for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2011 15:18:37 +0000 Received: (qmail 14771 invoked from network); 12 Jan 2011 15:18:28 -0000 Received: from 188-23-79-189.adsl.highway.telekom.at (HELO [192.168.1.101]) ([188.23.79.189]) (envelope-sender ) by smarthub94.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 12 Jan 2011 15:18:28 -0000 From: Gerhard Hickl To: "rsgb_lf_group@blacksheep.org" Date: Wed, 12 Jan 2011 16:18:23 +0100 Message-ID: <1294845503.2424.23.camel@gerhard-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: "Noisy" antenna on VLF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d40ce4d2dc68c4adb X-AOL-IP: 195.171.43.25 Dear group! A few weeks ago, when I did my first test on VLF with my LF-station antenna, there was a thread dealing with acoustical noise generated when transmitting on VLF with about 100W. Meanwhile I was able to increase then antenna-current from 400 to 500mA and accordingly the "singing" of the antenna is even louder now. I think I have found 2 different sources of noise: 1. The loading coil which is located behind the house. This is something I expected. 2. The ends of the antenna wires. My antenna basically has the shape of a "Y" and so I have got two open ends. One is located in front of my house and the other is the end of a stub over to my neighbours garden. The distance between those open ends is at least 40m. The interesting thing is that the loudest singing appears when you stand right under those open ends. When you walk from one to the other, the sound would nearly disappear right in the middle but getting louder as you approach the other open end. So if anybody has an explanation for this or has witnessed a similar thing, please let me (us) know. 73 OE3GHB Gerhard